Remove BODY onunload Event After Page Has Loaded

The onunload can be used to perform an action or to call a function when the user leaves a webpage.

There are scenarios however when you might want to remove this action after the page has loaded. Take a look at the simple example below where I present a very basic HTML page containing an onunload attribute on the <body> tag, then also a link that, when clicked, removes this onunload event: